CSS Horizontal Overflow Question

I’m working on a piece that requires the contents of a DIV to be hidden if the extend beyond the horizontal boundries of the box. However, if the contents extend beyond the vertical boudries, the box should become taller to accomodate the difference.

In IE, there is an non-standard overflow-x property, that works for just these situations.

Does anyone know of a standard’s compliant method to achieve this same effect?